Pulverized-coal-burning locomotive



2 Sheets-'Sheet 1 V. Z. CARCRIST F i1ed March 6, 1925 PULVERIZED COALBURNING LOGOIIOTIVE Jan. 20, 1931 INVENTOR Zuur/aldi;

y- MW A TTORNE V3 Jan. 20,/1931. V. z. cARAcRlsTl 1,789,697

PULVERIZED COAL BURNING LOCOMOTIVE Filed umn 6, 192s -2 sn'nwsneet s l aa f i INVENTOR @WM/ffm 151x/v "/"Uf/un/ A TTORNEYS Patented Jan.20.1931V lUNITED .STATES 4,PA'rlzN'r v01u-"lau j VIBGmUB Z. CBACBIBTI,0l' BBONXVILLE, NEW YORK, ASSIGNOR, BY MESNE As- BIGNIENTS T VIBGINIUSZ. GABACBISTI, 0F NEW YORK, N. Y.

appunti@ mea man 0,.-1925. semi no. 13,503.

This 'invention relates to locomotives burnifllrlgl pulverized coal orother ifinely divided Alocomotive fire box, because of clear- 6 ances'and other practical limitations, is of comparatively small size.

One ofthe objects of my invention, therefore, is to o Y of travel forthe 'fuel and flame within the llirebox. v`

Another object is to minimize diiculties encountered with the closin orhoneycombing over of the ilues b regxse matter.

Still other objects o the invention-'are to l# insure and remote ro randrapid combustion wit the x; and toobtain high boiler, efficiency andevaporation.

. till another object of the invention has to do with' the extension ofthe life of such refractories as may be needed within the box .forbaming and combustion purposes. this connection the duty imdposedbricks, articularly where. e fuel 1s burned in ow ered form, is verysevere. J 25, e foregoing together with such other objects as v-mayeremafter appear, or are incident to my invention, are realized by aconstruction which I have illustrated in preferred form in theaccompanying drawings, wherein' Y j Fig.- 1 is a longitudinal sectionthru a locomotive lire box embodying mv invention.

Fig. 2 is a half section talen on the line 2-2 and a half section takenon the line 2a-2a of Fig, 1;

Fig. 3 is a section taken on the line-33 of Fig. 1; e Fig. 4 is asection taken n the line 4-4 o f Fig.1;and, 4 Fig. 5 is a sectionsimilar to Fig. 3 illustrating a modification of the invention.

,Referring now to Fig. 1, there is shown the usual form of inside andoutside fire-box, re-

spectively comprising zthe ue sheet 7 the d so as to provide the usualwater legs closed at tain maximum length u pon such I inside back sheet8, the inside side sheets 9,'

l the bottom by the'mud ring 16.I Theiues v door 19.

Extending downwardly from the box,

from the region of the mud ring1 16 is a lire f' pan "A consisting of ametallic s ell member 20 lined at the sides,.rear and bottom withrefractory material a. The front wall of the fire aan is in substantialalignment with the insi e throat sheet 10 and it is covered by arefractory wall b extending'l upwardly to the circulation tubes 21.

Thecirculation. tubes 21 connect the front and rear water legs, risingupwardly and rearwardly from the front water leg. These tubes are spacedmuch more closely than is customary in locomotive practice where, at

In most, four such tubes are used.

Carried by the tubes 21 and extending from the front water legrearwardly a portion of the length of the lire box, is a refractory archor bale B, the construction of which will be later more fully described.

Extending forwardl and upwardly from the lower portion of t e rear waterleg is a set of circulation tubes 22, the upper ends of which areexpanded into the crowm sheet 11 at about midway of its length. Bothsets of tubes 21 and 22 are bent so as to provide more readily forexpansion'and contraction. The

tubes 22 intersect with the tubes 21, passing therebetween, at a pointabout midway of the length of the .fire box and above the middle pointin its'height. The tubes 2 2 carry an arch C of refractory bricks to behereinafter described.

It will be observed on inspection of Figs.

1, 2 and 3 that the tubes 21 have longitudinal fins 23 secured onopposite sides thereof and extending part of the distance from the frontwaterle to the rear water le'g. These fins are refe ably welded on andare of such widt as will enable them to conduct heat to the tubeswithout burning olf. The side i tubes 21 havelonly one such fin.

The arch B is composed of center brlck 24 and wing brick 25.' The centerbricks are somewhat ,T sha ed and, by virtuek of the close spacing of te tubes 2l, are of relatively small dimension, this dimension being fur-`ther decreased in the web portion of the bricks the tubes and fins notonly because the latter' directly shield the bricks, but also Ibecausethey absorb heat therefrom. The cooling effect of the tubes and fins onthe tongues or vertical legs of the bricks is such that they will notwear out rapidly. The wing bricks are protected by the cooling effect ofthe sideslieets and the side tubes.' Since these bricks do not wear outas rapidly as the center bricks, they do not need protection "to thesame extent.

The tubes 22 are similarly provided with fins' 23, such fins terminatingat about the point of intersection of the two sets of tubes.

The rear arch C extends from a point approximate the rear end ofthebale'or arch B, a portion of the distance toward the back water leg.This archconsists of center brick 24, such as above described, the wingbrick being omitted. The center bricks are held against slidinglongitudinally of the tubes 22 by virtue of spacer bricks 26 which aresocketed so as to rest on topof the tubes 22, as indicated in Figs. 1and 2. These spacer bricks engage and support the lowermost center brickof the arch C as indicated in Fig. 2. y

For the reasons alreadypointed out it will be apparent that all of thebricks of the rear arch are protected from the action of the flames andpresent but a small total area to the Haines.

' By virtue of the construction of the rear arch, a passageway 27 existsat, each side thereof as well as a plurality of passages between thetubes and the lowermost end of the arch C and the water leg. The archesB and C considered together form an inverted v air being supplied tosuch inlets by rvirtue V-shaped arch, the forward leg ofwhich abutsagainst the throat sheet 10 and the rear leg of which terminates shortofthe sheet 8.

The pulverized coal is supplied from the tender and led to one or moreburners D by the pipe or pipes 28, air being preferably used as thecarrying medium. Additional air is drawn into the burner or burners andthe burners discharge thru the rear wall 29 of the ire box. nimediatelyabove the point of fuel introduction, I provide an arch 30. The sidewalls of the fire pan are provided with two or more rows of auxiliaryair inlets 31,

of the circumferential duct 32 which may be formed in any desired mannerand which 1s providedr with a damper controlled inlet,

notl shown, whereby control of the air- Suipply to the aum'liary inletsmay be controlled.

Assuming that the lire box is hot enough upwardly toward the Aarch B bywhich the fuel and flame stream is guided toward the rear, part of thedame passing upwardly thru the passages 27 at the sides of the arch Cand part passing overv the rear end of the arch C. The Haine then bendsand travels forwardly toward the ues. As the fuel enters and as the fueland flames traverse the lire pan, the fuel r particles and the burninggases are continuously brought into contact with fresh air .andsimilarly in its vreverse bend, the fuel and flame stream draws upon theair induced thru the inlets 31. The effect of the arches, the tubes, andthe 'various passages is to promote effective mixture.

The forward wall b is subjected to scouring action and is therefore madequite substan tial. The arches B and C are protected in the manneralready described from that portion of the Haine' therebeneath'. Theupper surfaces Aof the arches radiate heat 'to the flame thereabove, butsince combustion hasV been already well carried forward and since alarge portion of the refuse particles, particularly the heavier ones,have already been tangentially discharged from the fuel and llame streamthere is no scouring action of any con-l sequence on the upper faces ofthe arches.

The fire pan and the arches cooperate to radiate heat to a centrallocus, insuring roper combustion and overcoming the chllling effect ofthe side sheets of the fire box.

The tubes 21 and 22 are in the nature of screens from which the fuel andflame stream must pass and they, of course, absorb a large quantity ofheat, in Aconsequence of which whatever refuse particles are carriedover the' arches forwardly, are cooled to the extent such as minimizeshoneycombing or bridging effects over the fiues. v

The refuse which is formed and deposited' in the fire pan'runs to thedischarge hopper It will be seen from the foregoing that I haveprovi'dedan effective arrangement for subjecting the fuel to radiantheat and for supplying the fuel with air as combustion proceeds and forprotecting the baflles as well as the flues, at the same time securingthe maximum length of flame travel, and a rfect mixture of fuel and air,whereby comustion 'is completed within the fire box.

In the arrangement of Fig. 5 the fins are omitted, reliance being placedupon the tubes alone for the protection -of the refractories.

In all constructions it will be seen that even if is very littleliability of any of such brick` being dislodged.

Since locomotives ordinarily have comparatively short runs, as comparedto station- Y ary practice, there ample opportunity provided forcleaning vout,any deposits of refuse at points other than in the hopper.

The fire pan is carried from the mud ring as shown, whereby the same maybe readily applied to existing locomotives. The method lof support is aconvenient way for providing an air supply duct.

The zone defined by the pan, front wall and the arches may be termed amain combustion 4 space in which ignition, partial combustion andgasification take place. Here there is room for expansion. 4Theremaining portions of combustion space are smaller in cross section asthe gases contract somewhat because of the absorption of heat. Theformer region is, therefore, largely bounded by -refractories forcombustion purposesand is preferably larger. Y,

I claim: 1

1. In a pulverized fuel burningr locomotive, a lire-box havingrearwardly and upwardly extending circulation tubes and upwardly andforwardly extending circulation tubes crossing one another, burner meansat the rear of the box for admitting fuel beneath the tubes in a forwarddirection, an arch carried by the first tubesand extending for the widthof the box part way from the front tol the 'rear leg, and an archcarried by the second tubes and extending from the first arch part wayto the rear leg.

2. In a pulverized fuel burningv locomotive, a fire-box havingrearwardly and upwardly extending vcirculation tubes and upwardly andforwardly extending circulation tubes crossing one another, burner meansat the rear of the box for admitting fuel .beneath the tubes in aforward direction, an arch carried by the first tubes and extending forthe width of the box part way from the front to the rear leg, and anarch carried by the second tubes and extending from the first arch partWay to the rear leg and terminating substantially short of the sidesheets.

3. In a pulverized fuel burninglocomotive, a fire-box having rearwardlyand upwardly extending circulation tubes and upwardly and forwardlyextending circulation tubes crossing one another, burner means at therear of the box for admitting fuelbeneath the tubes in a forwarddirection, an arch carried by the first tubes and extending for theWidth ofthe box part way from the front to the rear leg, and an archcarried by the second tubes and extending from the first arch part wayto the rear leg and terminating Substantially short of the side sheets,to-

gether with a refractory fire pan below the arches.

4.`In a pulverized fuel 'burning locomotive, a fire-box havingrearwardly and upwardly extending circulation tubes and upwardly andforwardly extending circulation tubes crossing one another, burner meansat the rear of the box for admitting fuel beneath the tubes in a'forwarddirection, an arch carried by the first tubes and extending for thewidth of the boxopart wayfrom the Y front tothe rear leg, and an archcarried by the second'tubes and extending from the first arch part wayto the rear leggand terminating substantially short of the side sheets,together with a refractory fire pan b elow the arches and means abovethe bottom of the pan and beneath the arches for admitting air forcombustion.

5. In a pulverized fuel burning locomotive, a fire-box having rearwardlyyand upwardly extending circulation tubes and upwardly and forwardlyextending circulation tubes crossing one another, means for ad mittingfuel therebeneath, an arch carried by the first tubes and extending forthe width of the box part way from the front to the rear leg, an archcarried by the second tubesand extending from the first arch part way tothe rear leg and burner means at the rear of the box for admitting fuelforwardly beneath the arches together withoa third arch overlying theburner means and adapted to prevent short circuiting of the fuel andflame.

6. In a pulverized fuel burning locomotive, a fire-box having rearwardlyand upwardly extending circulation tubes and upwardly and forwardlyextending circulation tubes crossing one another, burner means at therear of the box for admitting fuel beneath the tubes in aforwarddirection, an. arch carried by the first tubes and extending for thewidth of the box part way from the front to the rear leg, and an archcarried by the second tubes and extending from the first arch part wayto the rear leg and terminating substantially short of the side sheets,together with a third arch overlying the burner means and adapted toprevent short circuiting of the fuel and flame.

7. In a pulverized fuel burning locomotive, a fire box, burner means fordelivering fuel into said box in a forward direction adjacent the bottomthereof, an outlet in an upper forward portion lof the box and an inifuel into said box ina forward direction adjacent the bottom thereof, aset ofp water tubes vin said box extending upwardly and v forwardly fromthe rear wall thereof, a secl throu h adjacent the rear of the jacentthe bottom thereof, a set of water tubes ond set 'of tubes in said boxextending rearvwardly and upwardly from the front wall thereof andseparate bao means supported on the lower portion of said sets of tubesandl meeting at their upper edges, the bams associated with theupwardlyand forwardly extending tubes having an openin there- V re box,where y the fuel and flame stream is caused Yto contact serially withthe lower portion of said second mentioned set of tubes, said firstmentioned set of tubes and the upper portion of said second mentionedset.

9. In a pulverized fuel burning locomo` tive, a fire box, burner meansfor delivering fuel into said box in a forward direction adin said boxextending upwardly and forwardly from the rear wall thereof, a second lset of tubes in said box extending rearward- .1y and upwardly from thefront wall thereof, a an outlet above and forward of said secondmentioned set of tubes and separate baie means supported on the lowerportions of said sets and meetinat their upper edges, the y baleassociated wit the upwardly and forwardly extending tubes having anopening therethrough ad]a.cent the rear of the re box, where y the fueland llame stream is caused to contact serially with the lower portion ofsaid second mentioned set, the lower ,portion of said first mentionedset, the upper portion of said second mentioned set and the upperportion of said first mentioned set, and to pass to said outlet.

In testimony whereof, Il have hereunto',

si ed m fname.

gn* VRGINIUS Z..CARACRISTI.

' messer

